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| <h2 id="console_printf"><font color="F2853F" style="font-size:24pt"> console_printf</font></h2> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code> void |
| console_printf(const char *fmt, ...) |
| </code></pre></div> |
| |
| <p>Writes a formatted message instead of raw output to the console. It first composes a C string containing text specified as arguments to the function or containing the elements in the variable argument list passed to it using snprintf or vsnprintf, respectively. It then uses function <code>console_write</code> to output the formatted data (messages) on the console.</p> |
| <h4 id="arguments">Arguments</h4> |
| <table> |
| <thead> |
| <tr> |
| <th>Arguments</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>fmt</td> |
| <td>Pointer to C string that contains a format string that follows the same specifications as format in printf. The string is printed to console.</td> |
| </tr> |
| <tr> |
| <td>...</td> |
| <td>Depending on the format string, the function may expect either a sequence of additional arguments to be used to replace a format specifier in the format string or a variable arguments list. va_list is a special type defined in <cstdarg> in stdarg.h.</td> |
| </tr> |
| </tbody> |
| </table> |
| <h4 id="returned-values">Returned values</h4> |
| <p>None</p> |
| <h4 id="notes">Notes</h4> |
| <p>While <code>console_printf</code>, with its well understood formatting options in C, is more convenient and easy on the eyes than the raw output of <code>console_write</code>, the associated code size is considerably larger.</p> |
| <h4 id="example">Example</h4> |
| <p>Example #1:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>char adv_data_buf[32]; |
| |
| void |
| task() |
| { |
| char adv_data_buf[32]; |
| |
| console_printf("%s", adv_data_buf); |
| } |
| </code></pre></div> |
| |
| <p>Example #2:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>struct exception_frame { |
| uint32_t r0; |
| uint32_t r1; |
| |
| struct trap_frame { |
| struct exception_frame *ef; |
| uint32_t r2; |
| uint32_t r3; |
| }; |
| |
| void |
| task(struct trap_frame *tf) |
| { |
| console_printf(" r0:%8.8x r1:%8.8x", tf->ef->r0, tf->ef->r1); |
| console_printf(" r8:%8.8x r9:%8.8x", tf->r2, tf->r3); |
| } |
| </code></pre></div> |
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